I think the big intimidating mix idea is a really good one too. Laur, I saw a dog at the humane society almost 15 years ago. He could have been your perfect dog. Seriously. I still think about him years later, wishing I was in a place to have a dog when he was there.
He was solid black, prick eared, with the working GSD conformation. Not any of the newer extreme styles, just a good old Horand style dog. He had two ice blue eyes, a tiny white bib, white socks, and a white tip on his tail. I have no idea what mix he was. The card said BC/GSD, though it couldn't have been a 1st gen X with the blue eyes.
He was STUNNING, and a love, and about 65 lbs. I took him out and played with him several times, just a super dog. He's probably no longer on this earth, but there could easily be an amazing, gorgeous, mix dog out there with all the qualities you want and love.
Sorry for the novel. lol, that just sorta sent me down memory lane.